Air Distribution System

Abstract

An air distribution system has an elongate distribution conduit which receives an axially directed air flow. At least one venting region is provided along the conduit and includes at least one aperture extending through the conduit. A control cover is mounted over the conduit so as to rotate axially about in one of the venting regions, and the cover is rotatable to selectively cover and at least partially uncover an aperture.

1 . An air distribution system comprising:
 an elongate distribution conduit defined by a wall and having an axis, the conduit receiving an axially directed air flow therethrough;   at least one venting region along the conduit including at least one aperture extending through the wall;   a control cover mounted over the conduit for axial rotary movement thereabout in one of the venting regions, the cover being constructed to be rotatable to selectively cover and at least partially uncover the aperture.   
   
   
       2 . The air distribution system of  claim 1 , wherein the control cover conforms to the conduit over at least a portion of its circumferential extent. 
   
   
       3 . The air distribution system of  claim 1 , wherein the control cover extends circumferentially over more than half the circumference of the conduit. 
   
   
       4 . The air distribution system of  claim 1  wherein an aperture is larger in the axial direction than the circumferential direction of the conduit. 
   
   
       5 . The air distribution system of  claim 1  wherein a venting region includes a plurality of apertures circumferentially spaced on the conduit, so that the cover may be rotated to selectively cover and at least partially uncover at least a second aperture. 
   
   
       6 . The air distribution system of  claim 5 , wherein the control cover conforms to the conduit over at least a portion of its circumferential extent. 
   
   
       7 . The air distribution system of  claim 5 , wherein the control cover extends circumferentially over more than half the circumference of the conduit. 
   
   
       8 . The air distribution system of  claim 5  wherein an aperture is larger in the axial direction than the circumferential direction of the conduit. 
   
   
       9 . The air distribution system of  claim 5 , further comprising at least a second venting region axially spaced from another venting region, whereby air may be distributed at spaced locations along the conduit. 
   
   
       10 . The air distribution system of  claim 9 , wherein the control cover conforms to the conduit over at least a portion of its circumferential extent. 
   
   
       11 . The air distribution system of  claim 9 , wherein the control cover extends circumferentially over more than half the circumference of the conduit. 
   
   
       12 . The air distribution system of  claim 9  wherein an aperture in one of the venting regions is larger in the axial direction than the circumferential direction of the conduit. 
   
   
       13 . The air distribution system of  claim 1 , further comprising at least a second venting region axially spaced from another venting region, whereby air may be distributed at spaced locations along the conduit. 
   
   
       14 . The air distribution system of  claim 13 , wherein the control cover conforms to the conduit over at least a portion of its circumferential extent. 
   
   
       15 . The air distribution system of  claim 13 , wherein the control cover extends circumferentially over more than half the circumference of the conduit. 
   
   
       16 . The air distribution system of  claim 13  wherein an aperture in one of the venting regions is larger in the axial direction than the circumferential direction of the conduit.